docs: def unpack(self, unpacker):
          """
          unpack the contents of this instance from the values in unpacker
          """
  
          (a, b, c) = unpacker.unpack_struct(_HHH)
  
          self.access_flags = a
          self.name_ref = b
          self.descriptor_ref = c
          self.attribs.unpack(unpacker)